C#

public abstract class MyBaseClass
{
    public delegate void BtEventHandler(object sender, EventArgs e);
    
    public event BtEventHandler RecordImported;
    
    protected virtual void OnRecordImported(EventArgs e)
    {
        if (null != RecordImported)
        {
            try
            {
                RecordImported(this, e);
            }
            catch
            {
                // Ignore any errors raised 
                // in event handlers
            }
        }
    }
}
 
public class MyDerivedClass : MyBaseClass
{
    public void ImportRecord()
    {
        // Raise the RecordImported event:
        OnRecordImported(EventArgs.Empty);
    }
    
    // If you need to intercept the event, it
    // is much more efficient to override the
    // method than to attach an event handler
    // to the event.
    protected override void OnRecordImported(EventArgs e)
    {
        Console.WriteLine("Intercepted the RecordImported event");
        base.OnRecordImported(e);
    }
}